Energy, exergy and economic (3E) analysis and optimization of SOFC-semi-closed supercritical CO2 Brayton cycle hybrid power system

IF 7.5 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-03-03 DOI:10.1016/j.fuel.2025.134889

Yongyi Li , Haibo Sun , Yi Cai , Jiaxin Ding , Junpeng Zhang , Guoqiang Zhang , Zhimin Guan

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引用次数: 0

Abstract

To accommodate the sustainable use of energy, the large-scale application of solid oxide fuel cells (SOFCs) needs to address CO₂ emissions from using carbon-based fuels and the efficient utilization of high-temperature waste heat in the exhaust. This study presents a novel hybrid system that combines a SOFC with a semi-closed supercritical CO₂ (sCO₂) Brayton cycle. Ultimately, the configuration of the system is optimized using nondominated sorting genetic algorithm II (NSGA-II). The coupled impact of current density, fuel utilization factor, CO₂ recirculation ratio, and pressure ratio on the performance of the system is investigated along with energy, exergy, and economic analyses. The optimization results of the configuration demonstrate a distinct trade-off between net efficiency and levelized cost of energy (LCOE), with a maximum net efficiency of 74.39 % and a minimum LCOE of 0.0836 $/kWh. The stack constitutes 85 % of the total cost of the hybrid system, and its cost is highly sensitive to the operating pressure. Increasing the pressure ratio to improve net efficiency may lead to a significant rise in system costs. The energy and exergy analysis indicates that improving the system thermal integration can significantly boost performance by reducing exergy destruction during the heat exchange process.

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sofc -半封闭超临界CO2布雷顿循环混合动力系统的能量、火用和经济（3E）分析与优化

为了适应能源的可持续利用，固体氧化物燃料电池（sofc）的大规模应用需要解决使用碳基燃料产生的二氧化碳排放和废气中高温废热的有效利用问题。本研究提出了一种将SOFC与半封闭超临界CO2 （sCO2）布雷顿循环相结合的新型混合系统。最后，利用非支配排序遗传算法II （NSGA-II）对系统的构型进行优化。研究了电流密度、燃料利用系数、CO2再循环比和压力比对系统性能的耦合影响，并进行了能量、火用和经济分析。配置的优化结果表明，净效率和平准化能源成本（LCOE）之间存在明显的权衡，最大净效率为74.39%，最小LCOE为0.0836美元/千瓦时。该堆占混合动力系统总成本的85%，其成本对操作压力高度敏感。提高压力比以提高净效率可能会导致系统成本的显著增加。能量和火用分析表明，通过减少换热过程中的火用破坏，提高系统热集成可以显著提高性能。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.